EGFR and neoplasm: The SPECT/CT imaging (Figure 6(b)) of the subcutaneous tumors demonstrated significantly increased radioactivity accumulation in the MGC803 tumor (high EGFR expression) than in the HT29 tumor (low EGFR expression) (T/M: 3.21 ± 0.27 vs. 1.09 ± 0.07, P < 0.05).